An overworked summary (3-4)
I believe the answer is:
run-down
'summary' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for run-down that I've seen before include "Exhausted" , "In a neglected state" , "Shabby" , "Dilapidated" , "Worn-out" .)